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Avoid unnessary PlatformNotSupportedException when call EnableFastpath on win7 #45

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May 22, 2021
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Avoid unnessary PlatformNotSupportedException when call EnableFastpath on win7 #45

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12 changes: 9 additions & 3 deletions src/DotNetty.Transport/Channels/Sockets/SocketEx.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,8 @@ namespace DotNetty.Transport.Channels.Sockets
{
public static class SocketEx
{
private static readonly byte[] FastpathEnabled = BitConverter.GetBytes(1);

public static Socket CreateSocket()
{
// .Net45+，默认为AddressFamily.InterNetworkV6，并设置 DualMode 为 true，双线绑定
Expand Down Expand Up @@ -89,16 +91,20 @@ public static void SafeClose(this Socket socket)
/// See https://blogs.technet.microsoft.com/wincat/2012/12/05/fast-tcp-loopback-performance-and-low-latency-with-windows-server-2012-tcp-loopback-fast-path/
/// for more information.</summary>
/// <param name="socket">The socket for which FastPath should be enabled.</param>
/// <remarks>Code take from Orleans(See https://github.com/dotnet/orleans/blob/master/src/Orleans.Core/Messaging/SocketExtensions.cs). </remarks>
/// <remarks>Code take from Orleans(See https://github.com/dotnet/orleans/blob/main/src/Orleans.Core/Networking/Shared/SocketExtensions.cs). </remarks>
internal static void EnableFastpath(this Socket socket)
{
if (!PlatformApis.IsWindows) { return; }

const int SIO_LOOPBACK_FAST_PATH = -1744830448;
var optionInValue = BitConverter.GetBytes(1);
try
{
socket.IOControl(SIO_LOOPBACK_FAST_PATH, optionInValue, null);
// Win8/Server2012+ only
var osVersion = Environment.OSVersion.Version;
if (osVersion.Major > 6 || osVersion.Major == 6 && osVersion.Minor >= 2)
{
socket.IOControl(SIO_LOOPBACK_FAST_PATH, FastpathEnabled, null);
}
}
catch
{
Expand Down